<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像 -->
      <div class="avatar_box">
        <img src="../../assets/logo.png" alt />
      </div>
      <!-- 表单 -->
      <el-form
        class="login_form"
        ref="loginFormRef"
        label-width="0px"
        :rules="loginFormRules"
        :model="loginForm"
      >
        <!-- 输入框 -->
        <el-form-item prop="username">
          <el-input placeholder="用户名" prefix-icon="el-icon-user" v-model="loginForm.username"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            placeholder="密码"
            prefix-icon="el-icon-lock"
            v-model="loginForm.password"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      loginFormRules: {
        // 验证用户名 blur失去焦点触发验证
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },

  methods: {
    resetLoginForm() {
      // 重置表单函数
      this.$refs.loginFormRef.resetFields()
    },
    login() {
      // 验证表单，valid返回ture，确定验证是否成功
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        window.sessionStorage.setItem('token', res.data.token)
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  width: 100%;
  height: 100%;
  background-color: #2b4b6b;
  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
  }
  // 头像
  .avatar_box {
    width: 130px;
    height: 130px;
    border: 5px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    border-radius: 50%;

    img {
      width: 70%;
      position: relative;
      left: 50%;
      top: 50%;
      transform: translate(-50%, -50%);
      background-color: #eee;
    }
  }
  // 表单
  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
  // 按钮
  .btns {
    display: flex;
    justify-content: flex-end;
  }
}
</style>
